Air pump



Aug.v 12, 1930.

H. HAsTING I AIR PUMP Filed May 2s; 1929 Patented Aug. v12, 1930 HQMER I-IEAS'lllQG,` DETROIT, MICHIGAN 'AIR PUMP l Y `Application led May 23, 1929. Serial No. 365,252.

The present invention pertains to a novel lluid pump, particularly referring to that type of pump adapted for inilating pneumatic tires.

? The primary object of the present invention is to devise a double acting air pump which forces air into the tire on both the upward and downward strokes, the-pump being constructed to have no .outwardly projecting vair inlet members which .might easily be broken nor having any ball checked inlets subject to disorder. The pump is formed with ,a single compression cylinder in which is reciprocated adouble acting pisair inlet automatically controlled which permits Yboth the upward andldownward strokes of the double-acting piston to compress the airand force it out of a single outlet `which s Valso automatically controlled to lead the pressures' from bothA sides of the piston int'oa pneumatic tire. u Y 4 Another object o f the presentinventionis to provide'a double acting fluid pump which is of simple construction,havingV a simple and'eiicient valve mechanism controlling the air inlet which is arranged remotefrom the ground and thereby avoidsthey possibility of dirt or gritoentering they valve mechanism and preventing the pump to Aproperly function., l f l/Vith these and other objects in view the invention consists in matters hereinafter set forth and morev particularly pointed out in the appended claims, reference being'had to the accompanying drawings,in which Figure Vl isa side elevationV of a fluid pump constructed in accordance with n the` present invention; l

Figure Y2 is a vertical cross sectional view of the pump, illustrating the Vcompression pis-j ton nearingk the bottom of its pressure stroke 'with the inlet andwoutlet valve mechanisms in a position corresponding;

sectional view illustrating the compression piston beginning its f upward" compression A stroke with the inlet and outlet valve mechanism in a position corresponding; l -V ton, the pump'being provided with asingle Figure 3 kis a .fragmentary vertical cross' Figure 4 is a transversecross sectional view taken, on the line lle-4: of Figure 2; F igure 5 is a detail side elevation of the inf let controlling sleeve valve, and

Figure 6 is a fragmentary detail of the n lowerend of the air inlet over which the valve sleeve-slides. Y Like characters are employed throughout to designate corresponding parts. Y y

The present pump comprises a barrel or cylinder l having a cap 2 screwthreaded upon the upper end thereof and having' Va basemember 3 screwthreaded upon the lower end, the base member being provided with afootpiece L A4 tube 5 is brazed tothecylinder 1V n,

as at y6 andiskbent downwardly sov that-the axis thereofyis parallel with the axis .of the cylinder l, the tube 7 'being similarly brazed at 8 and bent to extend upwardly and lie parallel tothe'r cylinderl. yOver the ends of these tubes 5 and 7 is placed'a surrounding tube 9 provided with an outlet member l0 upon which ',isrmunted an air'pressure gaugev 11, the tube 9 extending a considerable distance over the ends ofthe tubes 5 and 7 which gives "an effective air seal. The endsof the tubes 5 and 7 are spacedl from each other andY the surrounding tubelO thereby forms acylinder 12in which is placed apiston 13, the

vfunction of vwhich will become apparent as L the description progresses.VIV

A elongated tube 14 extends through the', cap`2into the cylinder 1,theVA cap havingL suitable packing `15, held inplacebyfalnut" 176`ft0 prevent leakage of ,air aroundlthe tube Y gitudinalmovementfto the tube whichlis ,to

serve as al piston rody or plunger.

The lower Yendfof the tube 14" isplugged and tofpermitV .long ,ritudinall movement *thereof. The end of the tube `14; which extends Y as at is and isgjrtvided wana keyiewhich i extendsl through the tube y to project 1 outy wardly, thetube having' two ports 20 vand 21 positioned between the plug 18'pand` the key 19.*y A' sleeve y22 is mounted over Vthe lower end ofthe tube 14 and is provided with a slot 23 into which proiects the key 194,:` the sleeve being adapted 'to slide longitudinally,

the length of the longitudinal movement bein limited by flanges on the plug 18 and by the key 19. The sleeve 22 is provided with ports 24 and 25 which register with the ports 20 and 21 in a manner presently to be described. The sleeve 22 is further provided with a screwthreaded portion which supports a double acting piston 25.

It will be observed from the description that the piston 26 is mounted upon the sleeve` 22 which is slidable on the tube 14, the purpose and function of which will now bede? scribed. As illustrated in Figure 2 the piston is being forced downwardly and the air pressure below the piston causes the latter to move the sleeve 22 upwardly until the key 19 engages the end of the slot 23 at which time the port 2() in the tube 14 registers with the port 24 in the sleeve 22 and thereby leaves an open passage between the space in the cylinder above the piston 26 to the atmosphereV and permits air to enter to fill the space which otherwise would create a vacuum. The air being compressed below the piston 26 is forced into the tube 7 and exerts pressure on the piston causing it to rise and y seat against the lower end of the tube 5 and thereby permits the compressed air to go into .the line 10. The movement of the Piston 13 is assisted by the suction on the upper side of thepiston which will also cause suction in the tube 5 whenthe piston 2,6 is forced down- Pa wardly.

When the piston 26 has completed its downward motion and is being drawn upwardly the pressure on the upper side of the piston 26 causes the slidable sleeve 22 to move downwardly u on the stem 14 until the end butts against t e flanges on the plug 1,8. In

thisposition the port 22 in the tube 14 is in registration with the port 25 in the sleeve and air is thereby admitted to the lower side ofthe piston 26 through the tube 14. The air is compressed above the piston 26 and is forced into the tube 5, causing the piston 13 to seat `l'ipon theupper end of the tube 7 and permitting the pressure to enter the line 10.

The valvefports in the' tube 14 and the `sleeve 22 are so positioned that it is impossible for the ports 20 and 24 to be in registration whenthe ports 21 and 25am ,inV regis- ',tration. The piston 26m being mounted in this manner may be utilized to operate the Vvave mechanism which thereby becomes entirely automatic, requiring no s rings or parts whlch are liable to become isordered. .Upon the top of the piston actuating tube (14 where'it projects above Vthe handle 17 is rpoggided a nut 27 to which may be attached a line (not shown) which is in connection with a tank or any other member and by reciprocating the piston the air or fluid `may be pumped out of the tank or other mexnber.` `It therefore becomes apparent that the pump may be utilized as a source of forcing air into a receptacle or 1t may be utilized to pump the air out of a receptacle.`

Although a specific embodiment of the present invention has been illustrated and described, it will be understood that changes may be made within the scope of the appended claims without departing from the spirit of the invention and such changes are sonteinplated- What I claim is 1,. A double acting fluid pump comprising ac linder having valve controlled outlets at egel; end thereof, a tube extending into said cylinder and having spaced perforations in the lower end thereof, a plug for closin the lower end of said tube, a sleeve sli ably mounted on the lower end of said tube and provided with perforations spaced closer tof gether than the perforations in said tube and create a pressure .and force air out one of said outlets when reciprocated upwardly or downwardly in said cylinder and: to create a partial vacuum in the cylinder on the opposite side of the piston, and means for limiting the sliding movement of said sleeve so that the perforation insaid sleeve on `the rtial Lvacuum side of said piston is in reg.- lstration with a perforation in said tube to suplplyair at atmospheric pressure through sai tube to relieve the partial vacuum, said `means comprising slots formed in the upper end of said sleeve, and a key carried by said tube to project into said slots to prevent rotary movement and limit the longitudinal' movement of` said sleeve. y

2, A double acting fluid pum comprising a cylinder havin valve control ed outlets at each end thereo a tube extending into said ivllnder and having spaced perfprations in ing the lower end of said tube, a s eeve slidab y mounted 011 the lower end of said tube and provided with perforations spaced closer togetherthan the perforations in said tube and limited in sliding movement by said "J head plug, a double acting piston mounted on said sleeve between the perforations therein, means forlimitin the'slidin movement of said sleeve on sai tube so t at reciprocationV of said tube causes reciprocation of said piston and causes pressure in said' cylinder uponsboth the upward and downward strokes of said piston, said limiting means comprising slots formed in the upper end of said sleeve, and a key carried'by said tube to project into said slots in a manner preventing rotary movement of said sleeve and causing the perfbration in said sleeve on the suction side of said piston to register with a perforation i'n said tube.

lower' end thereof, a headed plu for clos- 3. A vdouble acting fluid pump comprising a cylinder having valve control ed outlets at each end thereof, a tube extending into saidV cylinder an-d having spaced perforations in the lower end thereof, a headed plug for closing the lower end of said tube, a sleeve slidably mounted on the lower end of said tube and provided with perforations spaced closer together than the perforations in saidtube and limited in sliding movement by said head plug, a double acting pistonV mounted on said sleeve between the perforations therein, means for limiting the sliding movement of said sleeve on said tube so that reciprocation of said tube causes reciprocation of said piston and causes pressure in said cylinder upon both the upward and downward strokes of said piston, said limiting means comprising slots formed` in the upper end of said sleeve, and a key carried by said tube to project into said slots in a manner preventing rotary movement of said sleeve and causing the perforations yin said sleeve 0n the suction side of said piston Yto Vregister with a perforation in saidV tube, and said sleeve closing the opening in saidtube on the pressure side of said'piston.

In testimony whereof I aiixmy signature.

' HOMER HASTING. 

